Improvement in metallic telegraph-poles



B. D. RA DCLI'F FE.

MetaIIic-Taleg raph Pole.

lf ink. Vu

UNITED STATES vEoEEET n. EADGLTEEE, or ALBANY, NEWv vonx.`

IMPROVEMENT IN METALLIC TELEGRAPHTPOLES.

g Specification forming paxtof Letters Patent No. 159,215, dated January 26, 1875-; applicatidiiitile u January 19, 1875.

I make a skeleton pole or post of longitud- Y inal metallic' angle or T bars, which are assembled around central core-pieces or disks placed atsuitable intervals apart, and are lere held in place by external bands-or rings,-

the bars being interlocked with the core-pieces or external bands, or both, in such manner that they can have no longitudinal movement independently of the same. A post or pole thus made is cheap, can be readily manufactured and put together, and possesses all that can be required in the way of strength, durability, and solidity.

The accompanying 'drawing represents a telegraph-pole made inacoordance with my invention.

Figure l is an elevation of the pole., Fig. 2 is a transverse section and longitudinal secj tion, representing the mode of connecting the bars with the core-pieces. Fig. 3 is a trans-- verse section and a longitudinal' section, representing the mode of connecting the bars with the outer bands. l

The longitudinal bars, Whichfform the main. portion of the pole, consist, in this instance,

of angle-irons A, which are assembled aroundf.

central core-pieces, preferably of'cast metal, and are there bound in place by external bands or hoops B. When power is..applied to the top of a pole of this kind, which tends to bend the pole to one side, the bars on the side opposite to that in the direction of which.the lection tends to take place are, it' the pole isA properly made, subjected to tensile strain, and the bars on the othcLside -are subjected to compression, and these, acting together, will give the greatest possible resistance to the power applied to bend the pole; but, with a pole made without any positive connection of the bars with the core-pieces, or with the external bands, it is diicult if not' impossible to obtain the tensile-strain. `'lo provide for this, therefore, I combine the bars with one or more of the core-pieces or external' bands,

or both,in such manner as to connect tliehr''l positively, and this without necessitating riveting. Thelcore-pieces, one of which is' shown at (l, Fig. 2, are provided with seats or recesses wot' a form corresponding to the shape of the parts of the bars A applied and fitted to'the same. In case the bars are to be united to the cores, the seats of the latter may be cast with projections @which enter notches or recesses c formed inthe contigu ons faces of the bars. -The bars? are thus intermite@ewirhtheLeQLresI-msthathanteren; not have. a movement independent.fot'f the other. In lieuvof this, the same resultlmay be effected by cutting the'. bars above and be.-

low the cores with a chisel, vforming chips.

which are turned out horizontally above and below the cores, and' thus constitute lugs or projections which hold in place the cores or .the positive connection may bemade with the external bands, as shown in Fig. 3, by notching theo'uter edges of the bars, as at d, and

fitting to these notches a sectional or dividedv inner ring, e, which may itself iit in the notches, or may have lugs. onits inner face to take into the notches.' When thesectional innerrings are fitted in place. the external bands B are driven or shrunk .tightly over and around them, in which case the two constitute, in et-l "feet, one band, and their union may be made still more 'permanent and secure by riveting them together; or in lieu of this', the external bands can be shrunk or driven on in' place,

and the bars can be cut with a chisel, as hereinbefo're suggested, to form on them lugs or projecting pieces* above and belowr the bands, by whichl the bands and bars will be held rmly together.' `The pole` tapers from base to top, so thatit is an easy matter to apply the external bands. It is not necessary that there should be' this positive connection between all the core-pieces or external bands and the longitudinal bars. It may be pro vided at such intervals throughout the length of the pole as required, in order to insure the necessary co-action of the parts. The ends of the bars at the topof the pole may be riveted to e eore-piece, or to a oep; amd at the bottom they may be fastened to a suitable enst-iron foot, though this is not indispensable. -A post o? pole thus made is adapted to a Wide rangel o uses.

Having 'described my invention, what I elaiin, and desire to secure by Letters Patent, 1S

A metallic skeleton post or pole, comprising the combination of central core-pieces, external bands, and intermediate longitudinal an- ROBT. D. RADGLFFE.

Witnesses B. Woon, J. HAMPDEN WOOD 

